In order to investigate the possible role of molds in respiratory allergy, skin prick tests with the extracts of 19 different fungi were applied to 614 respiratory allergic patients. Indoor mold samples of some of these mold sensitive patients are also presented. Most of the patients (72.6%) had extrinsic asthma while 27.4% having allergic rhinitis. The diagnosis was based on history, clinical examination and skin prick test which was done according to Peppy's method. Aspergillus fumigatus was the most important fungus causing skin test positivity (26.0%). Trichophyton rubrum, Mucor, Penicillium notatum, Aspergillus niger and Alternaria tenius species were also important in decreasing frequencies. A total of 26 species were isolated and Penicillium was the most important one (29.6%). Molds are thought to play an important role as causative agents for allergic rhinitis and asthma.